This calculator outputs the how fast the Dodge Challenger R/T can go in each gear as calculated by the gear ratios, engine redline and tire size.
The ultimate top speed may be limted by the power, drag and aerodynamics of each individual car.

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Tire Size(345/30/20)

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OR

Tire Diameter(inches)

Final Drive Ratio

Redline (RPM)

1st Gear

2nd Gear

3rd Gear

4th Gear

5th Gear

6th Gear

7th Gear

8th Gear

RPM

1st Gear

2nd Gear

3rd Gear

4th Gear

5th Gear

6th Gear

7th Gear

8th Gear

500

3.63

5.14

7.39

10.79

14.58

21.58

0

0

600

4.36

6.17

8.87

12.95

17.5

25.89

0

0

700

5.09

7.19

10.35

15.11

20.41

30.21

0

0

800

5.81

8.22

11.82

17.26

23.33

34.53

0

0

900

6.54

9.25

13.3

19.42

26.24

38.84

0

0

1000

7.27

10.28

14.78

21.58

29.16

43.16

0

0

1100

7.99

11.3

16.26

23.74

32.08

47.47

0

0

1200

8.72

12.33

17.74

25.89

34.99

51.79

0

0

1300

9.45

13.36

19.21

28.05

37.91

56.1

0

0

1400

10.17

14.39

20.69

30.21

40.82

60.42

0

0

1500

10.9

15.41

22.17

32.37

43.74

64.74

0

0

1600

11.62

16.44

23.65

34.53

46.66

69.05

0

0

1700

12.35

17.47

25.13

36.68

49.57

73.37

0

0

1800

13.08

18.5

26.6

38.84

52.49

77.68

0

0

1900

13.8

19.52

28.08

41

55.4

82

0

0

2000

14.53

20.55

29.56

43.16

58.32

86.31

0

0

2100

15.26

21.58

31.04

45.32

61.24

90.63

0

0

2200

15.98

22.61

32.52

47.47

64.15

94.95

0

0

2300

16.71

23.63

33.99

49.63

67.07

99.26

0

0

2400

17.44

24.66

35.47

51.79

69.98

103.58

0

0

2500

18.16

25.69

36.95

53.95

72.9

107.89

0

0

2600

18.89

26.72

38.43

56.1

75.82

112.21

0

0

2700

19.62

27.74

39.91

58.26

78.73

116.52

0

0

2800

20.34

28.77

41.38

60.42

81.65

120.84

0

0

2900

21.07

29.8

42.86

62.58

84.56

125.16

0

0

3000

21.8

30.83

44.34

64.74

87.48

129.47

0

0

3100

22.52

31.85

45.82

66.89

90.4

133.79

0

0

3200

23.25

32.88

47.3

69.05

93.31

138.1

0

0

3300

23.98

33.91

48.77

71.21

96.23

142.42

0

0

3400

24.7

34.94

50.25

73.37

99.15

146.73

0

0

3500

25.43

35.96

51.73

75.53

102.06

151.05

0

0

3600

26.16

36.99

53.21

77.68

104.98

155.37

0

0

3700

26.88

38.02

54.69

79.84

107.89

159.68

0

0

3800

27.61

39.05

56.16

82

110.81

164

0

0

3900

28.34

40.07

57.64

84.16

113.73

168.31

0

0

4000

29.06

41.1

59.12

86.31

116.64

172.63

0

0

4100

29.79

42.13

60.6

88.47

119.56

176.94

0

0

4200

30.52

43.16

62.08

90.63

122.47

181.26

0

0

4300

31.24

44.18

63.55

92.79

125.39

185.58

0

0

4400

31.97

45.21

65.03

94.95

128.31

189.89

0

0

4500

32.69

46.24

66.51

97.1

131.22

194.21

0

0

4600

33.42

47.27

67.99

99.26

134.14

198.52

0

0

4700

34.15

48.3

69.47

101.42

137.05

202.84

0

0

4800

34.87

49.32

70.94

103.58

139.97

207.15

0

0

4900

35.6

50.35

72.42

105.74

142.89

211.47

0

0

5000

36.33

51.38

73.9

107.89

145.8

215.79

0

0

5100

37.05

52.41

75.38

110.05

148.72

220.1

0

0

5200

37.78

53.43

76.86

112.21

151.63

224.42

0

0

5300

38.51

54.46

78.33

114.37

154.55

228.73

0

0

5400

39.23

55.49

79.81

116.52

157.47

233.05

0

0

5500

39.96

56.52

81.29

118.68

160.38

237.36

0

0

5600

40.69

57.54

82.77

120.84

163.3

241.68

0

0

5700

41.41

58.57

84.25

123

166.21

246

0

0

5800

42.14

59.6

85.72

125.16

169.13

250.31

0

0

RPM

1st Gear

2nd Gear

3rd Gear

4th Gear

5th Gear

6th Gear

7th Gear

8th Gear

Some additional information on how these are calculated:

When D is the diameter of the tire, the car moves forward a distance πD with each revolution of the tire. If there are F revolutions per unit of time, it moves forward at a speed of πD´F per unit of time. If D is in inches and F is in revolutions per minute (rpm), the above result will be in inches per minute. There are 63,360 inches in a mile and 60 minutes in an hour, so one inch per minute equals 60/63360 miles per hour or 1/1056 mph. So we have the following formula:

V(mph) = D(in) ´ F(rpm) ´ (π/1056)

In the automotive industry, the coefficient 1056/π is usually taken to be equal to 336 (exactly it is 336.1352398...) and the formula corresponding to the above is:

(mph)(gear ratio)(336) = (tire diameter in inches)(rpm)

With the above numerical approximation, both formulas are identical if we consider that (rpm)/(gear ratio) is the rate of rotation of the tires. So the "gear ratio" as the number of rotations of the driveshaft for each turn of the tire. This ratio is normally more than 1, except in overdrive gear. So, calling R the "gear ratio", your final answer is:

V(mph) = D(in) ´ F(rpm) ´ (π/1056) / R

or, approximately: V = (D ´ F) / (336 ´ R)

where V is the velocity (in mph), D the tire diameter (in inches), F the engine rpm, and R the gear ratio.